Filtering device for dust-removing pneumatic machines.



No. 353314; VBATENTED MAY 14, 1907.

I -J.R.BLUM.' A PILTERING DEVICE FOR DUST REMOVING PNEUMATIC MACHINES.-

APPLICATION IILED PBB.20, 1907.

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UNITED STATES PATENT OFFICE. JULES RENE BLUM, or PARIS, FRANCE, ASSIGNOR TO coMPANY LKsPL RATOR, or PARIS, FRANCE, A CORPORATION or FRANCE.

FILTERING DEVICE FOR. ousreemovme. PNEUMATIOIVIACHINES.

No. 853,914. Specification of Letters Patent. Patented May 14, 1907. Original application filedApril 19,1006, Serial 110312.672. Divided and this application filed February 20, 1907. Serial No. 358,451.

To all whom it may concern.-

Be it known that 1, Jonas RENE BLUM,

civil engineer, a citizen of France, residing at 49 Boulevard Preire, Paris, France, have invented new and useful Improvements in drawnin through the flexible tube o,being compelled to pass through the filtering en velop B before reaching the bellows, dep'oses its dust on the fibrous inaterialof the enspecification.

This invention which is a division of the application Serial N o. 312,672 filed April 19, 1906, relates to an improved. filtering device adapted to be used in connection with machines for removing dust by suction from carpets, furniture, curtains, tapestry and the cleaned.

like, and the principal object of the invention is to PI'OVldGl 'or a filtering device in winch the filtering material may be easily The accompanying drawing shows a vertical sectional view of a dust rcmovingpneuinatic machine incorporating the improved filtering device.

The dust removing machine comprises the usual flexible aspiration tube 0 terminated in a metallic suction mouth 0, the filtering devices which w'll be hereinafter described and claimed, amfi the bellows 1, 2, 3, 4 of the ind described and claimed in a separate application filed this day.

The filtering devices are inclosed in a hermetically closed box D of sheet metal arranged upon the stationary flap of the upper bellows 1. This box is provided with a tight closing door which are adapted to be fitted respectively in the aspiration tube 0 and in anotherajutage 9 leading to the suction compartment 7r of the machine. -Within the box D is arranged an ovoid receptacle A the Walls of which consist of inclosed material or the like. This envelop is ada ted to retain the dust and to let pass theret rough only the air.

The communication between the interior of the filterin envelop B and the suction compartment is insured by means of sleeve or rmg m provided for at the end of the ovoid frame A and adapted to be snugly fitted over the ajutage f of the box .I), the free borderof the envelop B being attached in any convenient manner to said sleeve or ring m.

During the operatlon, the d ust-ladcn an d and with two ajut ages e f hoops, a frame of metallic hoops.

velop and within the box D. The air enters For removing the envelop B in order to clean it, one proceeds in the following manner: The lid n of the casing of the machine is first opened, the tube 0 is drawn out of the ajutage e, the box D is then slightly moved toward the left to detach the ajutage f of the box from the ajutage 9 leading to the suction compartment is. The whole-box D is then drawn out, its door d is opened and finally the rece tacle A with the envelop B is drawn out oi the box, which allows thus to remove the envelop B.

To replace the filtering devices in the,

proper position, one proceeds in a reverse manner to the one above described. Having now described my invention, what I cla1m as new and desire to secure by Let' Filterin Devices for Dust-Removing Pneuthus the receptacle: A and the bellows per- ,matic achin'es, of which the following is a fectly pure.

combination, a hermetically closed'box D"" adapted to rest upon the stationary flap of the upper bellows of the machine, a door (1 'fitted 1n said box,- I for in said box and ada ted to be fitted in the i an ajutage e provided aspiration tube 0 of t 1e machine, a second a utage f provided for in said box and" in an ajutage 9 leading adapted to be fitted to the suction compartment, an ovoid rece tacle A having its walls made of, metal ic a sleeve or'ring m provided for at one end of the receptacle and adapted to be fitted over the second ajutage f of the box D, and an envelop or shell B of loose fibrous material arranged. about .the ovoid receptacle, substantially as described and for the purpose set forth. I

I11 testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JULES RENE BLUM. Witnesses ANTOINE I JAVOIX, HANsoN C. Coxn. 

